Which muscle assists in swinging movement of the arms and covers the front of the chest?

The pectoralis muscle plays a crucial role in the swinging movement of the arms and is located in the front of the chest, making it the correct choice for this question. It consists of two parts: the pectoralis major and the pectoralis minor. The pectoralis major, in particular, is responsible for actions such as flexion, adduction, and internal rotation of the shoulder joint, which are all movements involved in swinging the arms.

By covering the front of the chest, the pectoralis muscle not only contributes to upper body strength and movement but also helps stabilize the shoulder when the arms are in motion. This makes it essential for various activities that involve arm swinging, such as walking, running, and sports.

In contrast, while the deltoid muscle also contributes to arm movement, it primarily focuses on shoulder abduction rather than the swinging motion. The rhomboids help retract the scapulae and stabilize the shoulder but do not assist in swinging the arms. The latissimus dorsi, which is a large muscle in the back, aids in shoulder extension and adduction but does not cover the front of the chest or primarily assist in swinging the arms.